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E; J. TOOF.-

Try Square. No. 77,130. 1 Patented April 21, I868.

EDWIN J. TOOF', .OF' FORT amnisonrowa,

Letters Patent No. 77,130, dated April 21, 18'68 pantedatecl Apr- 2'1 11, 1868,

IMPROVEMENT IN TRY-SQUARES.

an fitlntult want in tit es jtltttt $211M mm mating mt at figs tame.

TO ALL WHOM ITMAY CONCERN:

Be it known that I, EDWIN J. Tool, of Fort Madison, in the county of Lee, and State of Iowa, have invented a new andusetul Improvement in Try-Squares; and I do hereby declare and make known that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings,.andzthe letters and-figures marked thereon, which form part of this specification.

The nature of my invention consists in the attachment or arrangement, in combination with a try-square,

used 'for the purpose of testing corners or angles-of lumber, to-ascertain whether the sa'mea're exactly square,

of an adjustable saw or other cutting-device, so'that upon applying the square to the corner to be tested, and moving the aforesaid'cutter, a cut isformed across the top of the board or its equivalent, whose bottom will always be at right angles with the vertical face of the board, when thesame may be planed down, and the angld is right rightangld with a certainty which requires no further test. I i p v I To enable those skilled-in the art to understand how to construct and use my said invention, I will proceed to describe the samewith particularity, making referoncein so doing to the aforesaid'drawings, in which Figure 1 representsu'side view of my invention. I v A represents a trysquarc, one face of which may have both arms thereof in the same plane.

' Upon one side thereof is arranged a saw or other edged device, which will cut into the wood as desired,

marked B, which is provided with oblique slots 6 I), as. shown,through which pass headed pinsu, which are rigidly secured to the try-square A. I Y I The cutting or toothed edge-of B-is always at right angles, with the vertical arm of the square, and though lying above the angle of'the square a's clearly seen lli tllQ drawingasyet upon being pressed forward by pressiugupon the roughened thumb-piece G, or otherwise, the direction of the slots 1) Zrcauses" the cutting-edge to passbelow the face-of the square itself, so that should the angle upon which the square is applied beirregular, the'cdge of the cutter in the above operation will be caused to cut through their-regularities, forming a ch'aunel or cut across the top of the article beingtcstecl, whose bottom is'at right an gle's with the vertical side of the same.-

Upon removing the square and planing down the surface true withsaid line or'cut so formed, the angle is invariahly-righted. I t i The cutter B may be secured to the'square in any other suitable manner than the one herein' described, provided the oblique downward movement be secured in the manner described.

Having described the construction and operation of my invention, I will nowxspecify what I claim, and desire to secure by LettersPatent. I

I claim, in combipation with a try-square A, an adjustable cutter B, arranged and operating substantially .in the manner and for the purposes set forth.

'E'. J. TOOF.

Witnesses: e W. E. Menus, E. 0. Bears. 

